4. the mole Flashcards
1
Q
2 ways of working out number of moles
A
- number of particles you have / number of particles in a mole (avagadro’s constant)
- mass / mr
2
Q
how to work out the number of atoms in something
A
moles x avagadros constant (Na)
3
Q
avagadros constant (Na) given in data book..
A
6.02 x 10 23
4
Q
how to work out number of moles of gas
A
number of moles = volume in dm3 / molar gas volume (24 dm3mol-1 at rtp)
…v
n | 24
5
Q
what is the ideal gas equation
A
pV=nRT p= pressure (Pa) (1KPa= 1000 Pa) V= volume (m3) (1cm= 1 x 10-6 m3) (1dm3= 1 x 10-3 m3) n= number of moles R= 8.314 JK-1mol-1 T= temperature (K= C+273)
6
Q
how many Pa in 1 Kpa
A
1000Pa
7
Q
how many cm in m3
A
1cm = 1x10-6
8
Q
how many dm3 in m3
A
1dm3 = 1x10-3
9
Q
how to work out Kelvin from Celcius (temperature)
A
K= C+273
